Ian,
Photos are limited unless you get a membership. You can host them somewhere else and link them using the insert image button in the toolbar, then you won't be size or quantity limited.
On the cab, if you search some of JohnnyC 's posts on Theiss and Toyota history you may find a lead, all I know is they were manufactured locally after arrival.
I'm not sure what you mean by a swivel hub kit. Knuckle bearings, wheel bearings and seals, are all the same as the 40. The inner wheel bearing and all metal wheel seal on the 25 spindle is a press fit, which is very strange when you run across it the first time, I can post up more information if you want. Anyhow, the new 40 parts are a direct swap. Ball and claw axles are common with the early 40, and the axle bushing is available from SOR over here, maybe even Toyota. Using a later 40 knuckle seal kit you can cut the felts for the seal at the ball.
Most of the other parts you listed are FJ25 specific, hopefully you can turn up something local. Nothing new is available. There are a few Aussies on here, searching for FJ28 will probably find them. I've got a few differentials, maybe a parking brake, shipping would be a killer.
If you get a chance post pictures of the frame extension, 45's had something similar, maybe it wasn't homemade.
